<template>
  <div>
    <h2>随机点名</h2>
    <div class="box">
      <span>名字是：</span>
      <div class="qs">{{ name }}</div>
    </div>
    <div class="btns">
      <button class="start" @click="start">开始</button>
      <button class="end" @click="end">结束</button>
    </div>
  </div>
</template>

<script>
const STRAT_VALUE = '这里显示姓名'
let timer = null
const NAMES = ['赵云', '张飞', '吕布', '貂蝉', '关羽', '诸葛亮', '大乔', '小乔']
export default {
  data() {
    return {
      name: STRAT_VALUE,
      timer: null
    }
  },
  methods: {
    start() {
     this.timer = setInterval(() => {
        const idx = Math.floor(Math.random() * NAMES.length)
        this.name = NAMES[idx]
      }, 1000 / 10)
     
    },
    end() {
      clearInterval(this.timer)
      this.name = STRAT_VALUE
    }
  }
};
</script>

<style>
* {
  margin: 0;
  padding: 0;
}

h2 {
  text-align: center;
}

.box {
  width: 600px;
  margin: 50px auto;
  display: flex;
  font-size: 25px;
  line-height: 40px;
}

.qs {
  width: 450px;
  height: 40px;
  color: red;
}

.btns {
  text-align: center;
}

.btns button {
  width: 120px;
  height: 35px;
  margin: 0 50px;
}
</style>